When separating out any type of mixture, man tends to employ the same universal technique. Introduce the mixture at one end and rely on a differential gradient (resistance) of some kind to separate the mixture into the desired individual constituents before they reach the opposite extremity.
A good analogy is a fast flowing river, whereby the material to be separated enters the water at one end (cathode) and the most buoyant items will race ahead carried on the fast flowing surface leaving the dense bulky items behind in their wake. This technique is used to good effect in many aspects of our daily life. Nature though has different ideas.
WR teaches that we live in two-way universe of motion. Rather that ‘injecting’ physical matter into the universe at one extremity to be carried on a cosmic current to the opposite pole, Source is introduced at the mid-point (bloc wall) between those two N/S polar extremes.
This implies that instead of the Cosmic river flowing simply in one direction, it flows in opposed streams so that the Cosmic current will carry positive dense matter towards the positive anode and nebulous matter will be carried in the opposite direction towards the cathode.
If matter is predominantly centripetal, it will orientate and migrate towards the anode. On the other hand, if matter is predominantly centrifugal, it will orientate and migrate towards the cathode.
As observers, we tend to perceive the universe as a outsider looking in 🙁